Binary Populations of Carbon-Enhanced Metal-Poor Stars
Robert G. Izzard (1,2), Evert Glebbeek (2,3), Richard J. Stancliffe, (4,5), Onno Pols (2) ((1) Institut d'Astronomie et d'Astrophysique,, Universit\'e Libre de Bruxelles, (2) Sterrenkundig Instituut, Universiteit, Utrecht, (3) Department of Physics, Astronomy
TL;DR
This study models binary star populations to understand carbon-enhanced metal-poor stars, finding that increasing third dredge-up efficiency in low-mass TPAGB stars improves agreement with observed star ratios.
Contribution
It introduces binary population nucleosynthesis models for CEMP stars and demonstrates how adjusting dredge-up efficiency aligns models with observations.
Findings
Initial models underestimated CEMP/EMP ratio by an order of magnitude.
Enhancing third dredge-up efficiency improves model-observation agreement.
Models suggest low-mass TPAGB stars play a key role in CEMP star formation.
Abstract
We construct binary-star population nucleosynthesis models of carbon-enhanced metal poor (CEMP) stars. We compare the CEMP to EMP (extremely metal poor) ratio of our models to the observed ratio and find it is an order of magnitude too small. Through an increase in the efficiency of third dredge-up in low-mass, low-metallicity thermally-pulsing asymptotic-giant branch (TPAGB) stars our models better match the observations.
Peer Reviews
No public reviews on file for this paper yet. If you reviewed it on a platform where reviews are public (OpenReview, ICLR, NeurIPS, ICML), you can paste yours below so the community can read it here.
Videos
No videos yet. Explain this paper in a talk, walkthrough, or lecture? Add one.